Adjustable guide fence for jointer



Aug. 14, 1956 w. s. TAYLOR ADJUSTABLE cum: FENCE FOR JOINTER 6Sheets-Sheet 1 Filed Sept. 13, 1951 J J v m H 8.141% W m 2 WW IN VENTORWILLIAM S. TAYLOR BY M ww ATTOR NE Y5 Aug. 14, 1956 w. s. TAYLOR2,75,617

ADJUSTABLE GUIDE FENCE FOR JOINTER Filed Sept. 13, 195.1 6 Sheets-Sheet2 1N VENTOR.

WILL IAM 5. TAYLOR ATTORNEYS Aug. 14, 1956 w. s. TAYLOR ADJUSTABLE aumFENCE FOR JOINTER 6 Sheets-Sheet 5 Filed Sept. 13, 1951 R O T m V mWILLIAM S. TAYLOR BY M, m

ATTORNEYS 4, 1956 w. s. TAYLOR 2,758,617

ADJUSTABLE GUIDE FENCE FOR JOINTER Filed Sept. 13, 1951 6 Sheets-Sheet 4-Z 226 we I /76 Z 7? /60 /88 2/3 /74 l /52 2/4 g My k6 m 222 I Q 204 Ifir? X 2 2 INVENTOR W\LL\AM 5. TAYLOR ATTORNEY:

Aug. 14, 1956 w. s. TAYLOR 2,753,517

ADJUSTABLE GUIDE FENCE FOR JOINTER Filed Sept. 15, 1951 6 Sheets-Sheet 5BY W WQ ATTORNEYS 4, 1956 w. s. TAYLOR 2,758,617

ADJUSTABLE GUIDE FENCE FOR JOINTER Filed Sept. 15, 1951 6 Sheets-Sheet 6zaa 254 35 f I W I 90 268 ,2 g j 306 S w 22 2 ,274

INVENTOR WILUAM S. TAYLOR ATTORNEYS United States atent O 2,758,617ADJUSTABLE GUIDE FENCE FOR J OINTER William S. Taylor, Three Lakes,Wis., assignor to Rockwell Manufacturing Company, Pittsburgh, 1321., acorporation of Pennsylvania Application September 13, 1951, Serial No.246,422 Claims. (Cl. 144-253) The present invention relates toimprovements in machine tools and more particularly to improvements onthe construction and arrangement of wood working machines of the typeknown as jointers.

The primary object of the present invention is to provide a noveljointer of an improved construction and arrangement which facilitatesadjustment and operation thereof and which greatly reduces thepossibility of injury to the operator during such operation andadjustment.

In adjusting and operating jointers of the prior art, it has beennecessary for the operator to stoop down to read the scales for thevarious adjustments, to move from place to place about the machine toeffect these adjustments and to expose himself to unguarded portions ofthe cutter knives during many of such operations. The necessity offrequently moving around the machine and stooping to read the scalesthereof in making the necessary adjustments results in addition in losttime and mo tion of the operator, increases the rapidity with which Inaccordance with this important object of this in vention, it is anancillary object thereof to provide a work guide mounting for a jointerof such construction that lateral and angular adjustments of the fenceposition can be rapidly and accurately made by an operator withoutdanger of injury while standing in his normal operating position.

A further ancillary object of this invention is to provide a new andimproved mechanism for adjusting the vertical position of the worksupport table of a jointer which is of such construction and arrangementthat adjustment of the depth of cut may be efiected with little effortby an operator standing in substantially erect operating position at oneend of the jointer.

An equally important ancillary'object of this invention is to provide animproved arrangement for shielding the jointer head by which the cutterhead is guarded in all adjusted positions of the lateral work guide sothat the various jointer adjustments can be made without danger ofinjury to the operator.

It will be recognized by those skilled in the art, that many of thefeatures of the present invention herein disclosed as of primaryimportance are equally applicable to heavy duty and lighter jointerconstructions.

In heavy duty jointers, it is customary to support the lateral workguide centrally of its length, rather than at one end as in the smallercapacity machines to avoid duly long unsupported work guide lengthswhich would deflect under load.

In the prior art, base extensions and work guide mounts each at leastequal in length to the overall necessary lateral adjustment of the workguide have been provided in the mounting of such centrally supportedlateral work guides. Such mountings result in an undesirable increase inthe overall size of the machines. To overcome this disadvantage of theprior art devices it is a further important object of the presentinvention to provide an improved mounting and adjusting mechanism forcentrally supported jointer lateral work guides which is of suchconstruction that a fence may be supported upon a base extension whichis approximately one half the length of the necessary lateral adjustmentof the Work guide, and by which locking and unlocking of the fence maybe effected rapidly and with minimum effort.

In the angular adjustment of work guide fences, it is preferable thatthe lower edge of the fence rest upon the work support surface and thefence be firmly locked in its position after adjustment so that no playexists between the fence and work support table which could produceinaccuracies in the cutting operations performed. In order that thelower edge of the fence be so positioned, it is necessary to provide formovement of the fence pivot axis, as well as angular movement of thefence about its pivot axis during the fence adjustment movement. Inprior art fence mounting structures, individual adjustments and lockshave been provided for each of these separate fence movements.Individual manipulation of the operating and locking mechanisms is thusrequired, and, in certain instances, final adjustment can only be madeby successive approximations of such adjustment.

It is a further object of this invention to provide an angular workguide fence adjusting mechanism by which the necessary adjustment of thefence about its pivot axis and of the pivot axis relative to the worksupport surface can be made simultaneously by but one operating linkageand by which a single locking device is effective to lock the fence inits adjusted position to eliminate all angular movement of the fence.

More specifically it is an object of this invention to provide anangular position indicating device for an angularly adjustable lateralwork guide which is of an improved construction by which the angularposition indication is independent of the adjusting mechanism so thatplay in such adjusting mechanism resulting from wear or manufacturingtolerances does not effect the accuracy of the indication.

It is a further object of this invention to provide a jointer with anovel guard structure for shielding the cutter head of the machine whichis effective to prevent injury to the operator by the cutter head duringoperation and adjustment of the machine regardless of the laterallyadjusted position of the work guide.

A still more specific object of this invention is to provide an improvedmechanism for mounting and resilient- 1y biasing a pivotal cutter headguard by which the biasing torque applied to the guard can be easilyadjusted and which is of such construction and is so located that itdoes not interfere with the adjustment of the depth of cut or thevisibility of the indicator for such adjustment.

The foregoing and other objects of the present invention will becomemore fully apparent by reference to the appended claims and to thefollowing detailed description when read in connection with theaccompanying drawings wherein:

Figure 1 is a side elevational view of a jointer embodying the improvedstructural features of the present invention with certain portions ofthe table and fence broken away;

Figure 2 is a plan view of the jointer of Figure 1, similar parts beingbroken away;

Figure 3 is a vertical sectional view taken substantially along the line3-3 of Figure 1;

Figure 4 is a fragmentary sectional view of the front greater? 3. worksupport table adjusting mechanism takenalong the line 4-4 of Figure 1;

Figure is a fragmentary sectional view of such mechanisnr taken alongthe line 5 -5 of- Figure 1;

Figure 6 is an irregular fragmentary sectional view of such mechanismtaken along the line 66 of Figure 5;

Figure 7 is an enlarged fragmentary plan view of the work guide" andwork guide mounting structure;

Figure 7A is a plan view of the pivot link of the workguide mountingstructure of Figure 7;

Figure 8 is a vertical sectional view taken along the line 88 of Figure7;

Figure 9 is" avertical sectional view taken along the line 9-9 of Figure7;:

Figure 10 is a vertical sectional view taken along the line 10-10 ofFigure 7 and showing the work guide angular adjustment indicatingmechanism;

Figure 11 is a vertical sectional view of the pivotal cutter head guardmount taken along' the line 11-11 of Figure 2; and

Figure 12 is a horizontal sectional view taken along the line 1212 ofFigure 11 The improved jointer ofthe present invention is shown inFigure l in a side elevational view, being viewed from the side at whichthe operator stands while operating the machine. As therein shown, thisjointer assembly comprises a supporting cabinet 20, in which the jointerdrive motor 22 is mounted,- a main jointer base 24 mounted centrally ofthe top of cabinet 20; a front work support table 26 and a rear worksupport table 28, both of which are mounted on the main base 24 fortranslatory movement relative thereto along vertically inclinedguideways, an adjustable work guide fence assembly 30; and a cutterguard 32 pivotally mounted upon a rabbeting arm 34 carried by the frontwork suport table 26. The present invention provides an improvedarrangement and construction for jointers by which the operator may makeand look all adjustments of the fence and of the support table whilestanding in his normal operating position beside the machine and withoutdanger of injury to himself.

Cabinet structlme The cabinet 20, within which the motor 22 is mounted,is of an improved construction, rendering it economical to manufactureandassemble, readily accessible for adjustment of the motor mounting,and pleasant in appearance; The cabinet 20 is formed of a top member36', of generally rectangular form preferably formed of castiron andfrom each corner of which depends a vertical leg 38. Legs 38 are alsopreferably formed of cast iron and are suitably secured to the topmember 36, such as by screws 40. A pair of longitudinal tie bars 42 and-44, conveniently formed of angle iron material and shown best in Figure3, join respectively, the bottom ends of the left side pair of legs 38and the bottom ends of the right side pair of legs 38, being suitablysecured thereto through screws 46 at their opposite ends. Longitudinaltie bars 42 and 44 are joined by a pair of transverse tie rods 48 and 50(Figure 1), which are in the form of cylindrical shafts secured at theirends to the longitudinal tie bars by screws 52. threaded into endopening tapped bores therein. The cabinet forms a very rigid support,and, having a cast'iron top member 36 and cast legs 38, absorbs much ofthe vibration resulting from operation of the joiuter. A

The transverse tie rods 48 and 50 also provide a rigid structure uponwhich the drive motor 22 can be adjustably mounted. The motor 22 ismounted upon a pair of identically formed longitudinaly extending strapbars 54 and 56 (Figure 3) the longitudinal configuration of which isbest shown in Figure 1,. through bolt and nut assemblies 58. Sleeves 60and 6]., which are rotatably and axially slidably mounted on tie bar 48are secured, respective, to a pair of adjacent ends of members 54 and 56as by Welding. An eye bolt 62 is secured to theother end of each ofmembers 54 and 56, the shanks thereof extending throughsuitableapertures formed through the members 54 and 56 and being axially fixedrelative thereto between lock nuts 64 and 66. The loop of each of theeye bolts 62 closely surrounds the cylindrical tie rod 50, beingrotatable and axially slidable relative thereto. By this construction,motor 22 may be pivoted about the shaft 48 and locked in its adjustedpivotal position by nuts 64 and 66 thus providing a means for adjustingthe tension of the belts driven thereby. The transverse position of themotor 22, relative to tie rods 48 and 50 is fixed by a pair ofcollars 68and 70, secured to tie rod 48 intermediate sleeves 60 and 6]. bysuitable set screws 72 as to axially abut the inner ends of sleeves 60and 61.. By release of set screws 72, motor 22 may be shiftedtransversely of the base structure 20 along rods 48 and S0, and fixed inany desired adjusted position by resecuring collars 68 and 70 to the rod48. By this motor mounting construction, motors of different size andmanufacture may be readily mounted on rods 48 and 50 and can be shiftedtransversely and pivotally rotated about the tie rod 48 for properalignment of the motor and proper tension of the drive belt.

The sides of the cabinet between legs 38 are preferably closed by aplurality of cover panels 74 secured to suitable flanges provided onlegs by screws 76. The panels 74 may be formed with louvers (not shown)to permit the circulation of air through cabinet 20 to cool motor 22, isdesired. A chip chute is provided in cabinet 20 by a transverse plate 78sloping downward from top casting 36 at a point 79 ahead of the cutterhead to the rear panel 74 for the direction of chips and dust thrown.downwardly from the cutting head from an opening 80 (Figure 3) formedthrough the top member 36 above the chute toward an opening provided inthe rear panel to permit discharge of the chips.

Table structure and cutter head mounting The base 24 of the jointer isfixed on the top of the cabinet structure just described by suitablesecuring means (not shown). A cylindrical cutter head 82 is journalledcentrally of the ends of base 24 for rotary movement about atransversely extending axis lying in the vertical transverse centerplane of base 24 which slopes downwardly from the approximate horizontalcenter plane of the cutter head to provide inclined table guide ways 84and 86. The tables 26 and 28 are mounted upon base 24 for translatorymovement relative thereto along these guides ways 84 and 86 respectivelyand at their opposing inner ends are undercut as indicated at 87 toextend over the cutter heads and define a cutter head openingtherebetween. The translatory movement of tables 26 and 28 effectsvertical adjustment of the top planar work support surfaces 88 and 90respectively relative to the cutter head 82, the undercut table endsbeing" of a configuration to cover the cutter heads in all positions ofadjustment except for the portion required to'' be exposed to secure thedesired depth of out (see Figure 1). j

The cutter head and cutter head bearing mounting construction is bestshown in Figure 3. As shown in Figure 3, the base 24' is a generallyhollow casting having side walls 94 and 96 joined by a pair oftransverse webs 98 and 100 spaced outwardly from the vertical centralplane. Coaxially aligned semi-cylindrical bearing seats or cradles 102and 104 (Figures 1 and 3) are suitably machined in the center of the topedges of side Walls 94 and 96 re speotively'. Cylindrical bearinghousings 106 and 108 having cylindrical bearing recesses therein, flattop surfaces 110 and 112 and a configuration adapting them to fit incradles 102 and 104 are respectively and rigidly secured therein bybolts 114 and 116 which extend upwardly through enlarged wall bosses 118and 120 and threadedly engage suitably aligned, tapped holes formed inthe bottom of the housings 106 and 108.

Cutter head 82- .has a pair of coaxially aligned shaft sections 122 and124, one projecting from each end thereand 132 to permit the pulleyshaft section, 124 in the illustration, to protrude beyond the walls ofbase 24. The opposite opening 131 is preferably closed by a plug 133 toseal the bearing recess from outside dust, etc. The cutter head 82 is,thus, journalled for rotation at the top of base 24 about a transverselyextending axis normal to the base side wall 94 and 96. i

The outboard end of shaft 124 projecting through coaxially aligned bore131 in housing 108 has a double sleeve pulley 138 secured thereto by akey 140. The cutter head 82 is driven from motor 22 through a pair of V-belts 142 which extend between pulley 138 and a double sleeve drivepulley 144 aligned therewith and keyed to the motor shaft 146.

The cutter head may be removed for adjustment or sharpening of theblades thereof by removing the bolts 114, and 116, and disengaging theV-belts 142 from pulley 148. For this purpose, the lower edge of thesidewalls 94 and 96 of base 24 are recessed as indicated at 150permitting access to bolts 114 and 116. The bearing housings 106 and 108are thus freed from their cradles 102 and 104 on the base 24 so that thewhole cutter assembly 82, the bearings 126 and 130, and their housings106 and 108 may be lifted from the base 24 as a subassembly.

This cabinet structure and motor mount is more fully disclosed andclaimed in copending application Serial No. 250,345 of Richard A. Buttkeentitled Planer and Attachments Thercfor, owned by applicants assigneeand filed October 8, 1951, and for this reason no claims to this subjectmatter are contained herein.

Work support table mounting Tables 26 and 28, as previously indicated,are mounted on base 24 for translatory movement along inclined guideways84 and 86 respectively, so that the elevation of their planar worksupport surface 88 and 90 can be adjusted vertically relative to thecutter head 82. As shown in Figure 4'; which is a fragmentary transversesection normal to the plane of table movement 84 and to the direction ofmovement of table 26, being taken along the line 4-4 of Figure 1, table26'is guided for inclined translatory movement toward the cutter head 82relative to base 24 by the coaction of machined planar V-gu'ideways 151and 152 of the left side wall 154 of table 26 with parallel machinedplanar V-guideways 158 and 160 on the base 24, and of V-guideway 166 ofthe right side wall 168, with parallel V-guideway 174 of base 24 and anelongated gib 176 interposed between the surface 177 and V-guideway 178and engaging way 174. These surfaces all extend in the direction oftranslatory movement of the table 26 relative to the base 24 to formdovetail guideways. Gib 176 is provided near one end with a conicalrecess which receives the conical end of an adjusting screw 179. Thisconstruction, together with an additional spaced set screw (not shown)adapted to abut the outer face of gib 176, provides an adjustment fortaking up the lateral play between the base 24 and the table 26 toassure a free sliding but accurate support for the table and accommodatefor wear. When it is necessary to take up any lateral play resultingfrom wear of the engaged surfaces, the screw 178 and its associatedabutment screw are screwed in to move the gib 176 toward the surface 172and thus eliminate such play.

The movement of table 26 relative to base 24 along these guideways iscontrolled by a combination feed screw and bell crank linkage now to bedescribed. As shown best in Figure 6, a boss 182, having a bore 184formed therethrough, is formed on the under side of1a transverselyextending wall 185 of base 24. A pivot pin 186, having an enlarged upperportion 188 is mounted in bore 184 being fixed therein by a nut 190threaded onto its lower end. A boss 192, which is integrally formed onthe underside of the top of front table 26, is provided with a threadedbore 194 in which the threaded end 196 of a pivot pin 198 is received.

As is best shown in Figure 5, which is a fragmentary sectional viewtaken along the line 5-5 of Figure 1 showing the table raising andlowering mechanism, pin 198 is the fixed pivot on table 26 by which abell crank 200 is mounted while the enlarged end 188 of pin 186 forms apivot fixed to the base 24 with which the bell crank is rockably andslidably engaged. The side walls 154 and 168 of front table 26 areformed, respectively, with aligned bores 202 and 204 in which the endsof a shaft- 206 are journalled, a support bushing 207 being provided inbore 202. The central portion of shaft 206 is threaded as shown at 208,and an externally cylindrical nut 210, formed with coaxially opposedprotruding pins 212 and 213, is threadedly received on the threadedportion 208 of shaft 206.

Bell crank 200 has two mutually perpendicular arms 214 and 215. The endof arm 214 is in the form of an axially opening slot while the end ofarm 215 is in the form of a yoke 216a, which partially straddles thecylindrical nut 210, the pins 212 and 213 being received in axiallyopening slots of the respective yoke arms. The end 188 of pin 186 isreceived in the end slot of arm 214.

Raising and lowering of the front table 24 is effected by rotation ofthe shaft 206 through a suitable handwheel or crank arm 217 fixed to theend thereof exteriorly of the wall 154, as is shown in Figure 4, by key218 and set screw 219. When the shaft 206 is rotated, the nut 210, beingheld against rotation between the upper and lower yoke arms of bellcrank arm 215, moves axially along threaded shaft portion 208. Pins 212and 213, which rockably and slidably engage the end slots of the opposedarms of yoke 216a, cause the bell crank 200 to rock about pin 198relative to table 26 as the nut 210 moves axially of shaft 206. The pin186 being rigidly secured to the base 24 and rockably and slidablyengaged with the end slot ofbell crank arm 214, rocking movement of thebell crank 200 about pin 198 tends to pivot the bell crank about pin186.Since pin 198 as well as shaft 206 and nut 210 are relatively fixed tothe front table 26, this pivotal movement ofbell crank 200 about pin 186moves table 26 along the inclined plane of base 24 on the dovetailedguideways. The arm 215, as illustrated, is approximately twice thelength of arm 214 so that the mechanical advantage of the screw and nutmechanism is doubled. This greatly facilitates movement of the table bythe handwheel 217 which also affords a mechanical advantage.

An adjusting mechanism, like that just described in relation to table26, is used for adjustment of the rear table 28 along plane 86, thetranslatory movement of table 28 being controlled by identicaldovetailed guideways as table 26.

The end of the shaft 206, opposite to that to which the handle 217 issecured, is provided with means for locking the shaft 206 in a fixedposition relative to the table 26 after an adjustment has been made. Forthis purpose, a pair of opposed transversely directed lock dogs 220 and221, the outer ends of which are machined fiat and the inner ends ofwhich are hemispherical, are received in a diametrally extending bore222 of shaft 206. A screw 224 having a conical inner end is threadedlyreceived in end bore formed coaxially in the end of shaft 206 andintersecting bore 222. When the screw 224 is threaded into the end ofthe shaft 206, the conical inner end bears against the hemisphericalends of dogs 220 and forces them radially outward of bore 222 intofrictional engagement with the wall of the bore 204 to prevent relativerotation between the shaft 206 and the table 26.

7 Anoperating handle or knob 2'26-is suitably fixed to the end of screw224 to facilitate manipulation thereof, at least for the from tablewhich is frequently adjusted to vary the depth of cut. Since the reartable 28 usually remains in a relatively permanent adjusted position,the screw 224 on the rear table locking means need not be provided withsuch a handle.

Referring now to Figures 1. and 6, the base 24 has cast into itsinclined edges on the operating side of the machine adjacent table 26 anelongated depression 228 having a planar surface inclined bothlongitudinally and transversely of the base 24. A flat graduated scale230 is secured to this inclined planar surface by screws 232. Acooperating pointer 233 is secured to the exterior side Wall 154 offront table 26 in position above scale 230 by screw 2'34 and coacts withscale 23%) to provide an indication of the vertical distance of worksurface 88 of table 26 below the cutting plane of cutter head 82. Scale230 is graduated to indicate, in fractions of an inch, the depth of outwhich, of course, is dependent upon the adjustment of the height of thefront table 26.

As the front table 26 is moved up or down its guideway, these coacting,relatively movable, angularly disposed, indicating elements will providean indication of the depth of cut, which is readily visible to theoperator while in his normal standing position at the left side of thefront table, by which he can conveniently adjust the table to thedesired depth of out by manipulating handle 217 while reading theindicated depth of cut upon the scale 230. This adjustment may beperformed by the operator while standing in his normal erect operatingposition without bending his head and body around to the side of thejointer as has been necessary in prior art devices. Minor adjustments ofthis depth of cutter indicator may be readily effected by looseningpointer securing screw 234 and rotating the pointer in the desireddirection around screw 234. In this way, the depth of cut indication maybe, within reasonable limits, kept accurate in spite of grinding andhoning of the cutter blades.

Adjustment of rear table 28 to maintain it in the cutting plane ofcutter head 82 is efifected in the same way as adjustment of table 26.

Work guide fence assembly structure The work guide fence assembly 30 ismounted on the rear support table 28 at the side opposite that at whichthe operator normally stands, its position being best shown in Figure 2.As will become apparent as this description proceeds, this assemblyincludes a lateral work guide or fence 235 which extends longitudinallyof the tables 26 and 28 and is mounted for adjustment transversely ofthese tables and for adjustment about a longitudinal axis for varyingthe angular relation of the fence planar guide surface 236 to thesupport surfaces 88 and 90 of tables 26 and 28. In the illustratedposition, planar surface 236 is normal to surface 88 and 90. Thecontrols by which the position of the fence 235is adjusted and lockedare of such construction that they may be easily and rapidly manipulatedby the operator to effect the necessary adjustment and are so locatedthat they can be manipulated by the operator from his normal position byreaching across the work support tables. The fence mounting structureand cutter head guard structure are such that these controls can besafely manipulated without danger of possible injury to the operatorregardless of the transverse position of the fence to the cutter head.

Referring first to Figures 2, 3, 7 and 8, fence assembly 30 is mountedupon a table extension 238 which is secured to the rear table 28 byscrews 240 (Figure 8) on the side opposite that on which the operatornormally stands. The top of table extension 238 is a planar surface 242,coplanar with the top surface 90 of the rear table 28. The fence 235 ispivotally mounted on a slidable mount or support 244' by .a pivot link246 to permit its angular adjustment relative to surfaces 88* and ceivedin a mating slot 252 formed across the bottom of a web 253 integral withthe support 244.

A mechanism of novel construction is provided for locking the support244 in a fixed position relative to the table extension 238 andpermitting free translatory movement of support 244 through a path, thelength of which is approximately twice that of table extension 238 uponwhich it rests while providing easy manipulation for locking andunlocking the support relative to the table extension 238. This lockingmechanism (Figure 8) is formed by an apertured member 254, which isnormally free to slide relative to the table extension 238 as well asrelative to the support 244 in the direction of movement of the support244 relative to the table extension 238, and which can be manipulated tofrictionally engage members fixed relative to the table extension 238and to the support 244 to prevent relative movement therebetw'een.Member 254, which conveniently is in the form of an eye bolt, isrotatably supported on the central portion 256 of a shaft 258 journalledfor rotation at its opposite ends in aligned bores in the front wall260, and rear wall 262 of the casting forming the mount 244. The centralportion 256 of shaft 258 is cylindrical and eccentric relative to theaxis of the journalled ends of shaft 258 so that a one-hundred eightydegree rotation of shaft 258 will shift member 254 from its extremeupper position, as shown in Figure 8, to an extreme downward position. Ahandle 264 is fixed to the end of shaft 258, exteriorly of the wall 262to facilitate manual rotation of shaft 258.

The member 254, which depends from the eccentric portion 256 of shaft258, extends through an elongated slot 266 formed through the top wall268 of table extension 238. Slot 266 is elongated in the direction ofmove- 11161112 of support 244 relative to table extension 238. The lowerportion of member 254 extends through the slot 266 and is in the form ofa threaded shank 270. A clamping bushing 272, having a cylindrical guideportion 274 approximately equal in diameter to the transverse dimensionof slot 266 and a radially extending flange portion 276 disposed beneathand larger in diameter than the transverse dimension of the slot 266, isfreely rotatably received upon the threaded shank 270 and limited in itsdownward movement by a pair of nuts 278 and 280 threaded onto the lowerend of the shank 278 below the clamping bushing 272.

When the shaft 258 is rotated so that member 254 is moved toward itsupper limit position, the flange portion 276 of bushing 272 is pressedinto tight frictional engagement with the peripheral edge 282 of theslot 266 and the member 254 is forced into tight frictional engagementwith the eccentric shaft portion 256 so that mount 244 and tableextension 238 are rigidly locked against relative movement. When theshaft 258 is rotated sufficiently to lower member 254 and release theflange 276 from engagement with the peripheral edge 282, the support 244can be shifted freely along its guide rail 248. When the bushing 272reaches the opposite end of slot 256 and the member 254 reaches theopposite end of the eccentric portion 256 of shaft 258 the forward limitof movement of the fence 234 has been reached. Thus, the path throughwhich the mount 244 and thus the fence 234, can be moved relative to thetable extension 238 is approximately equal in length to the sum of theoverall length of the slot 266 and the overall length of the eccentricportion 256 of shaft 258. For a given support and table extensionlength, this is approximately twice the overall lateral fence adjustmentattainable in prior art devices.

Pivot link 246, by which the fence 234 IS ptvotally mounted on support244, has, as is best shown in Figure 7a, two parallel side walls 284 and286 and an intermediate wall 288 parallel thereto. These three walls areintegrally joined by a transverse top wall 290 extending across the rearportion of the top thereof. Through the upper forward ends of walls 284,286 and 288 coaxially aligned bores 292, 294 and 296 are formed, and anupper pivot shaft 298 is rotatably received therethrough. Through thelower rear ends of walls 284, 286, and 288 are formed coaxially "alignedbores 300, 301 and 302 which rotatably receive a lower pivot shaft 304the axis of shafts 298 and 304 being parallel.

Lower pivot shaft 304 is also supported between a pair of arms 306 and307 formed as integral extensions of the mount 244 on its face adjacentthe fence 234. The faces of arms 306 and 307 are formed respectivelywith coaxially aligned arcuate recesses 308 and 309 (Figures 7 and inwhich the ends of shaft 304 are received, shaft 304 being fixed to thesearms 306 and 307 by screws 310 and 311. In this manner, pivot link 246is mounted upon the support 244 for pivotal movement about the axis ofshaft 304. I A pair of arms 312 and 313 are formed similarly on the faceof fence 234 opposite the work guide surface 236. These arms 312 and 313are respectively formed with coaxially aligned arcuate recesses 314 and316 (Figures 7 and 10) in their faces adjacent support 244, the ends ofupper pivot shaft 298 being received in these arcuate recesses 314 and316 and fixed thereto by screws 317 and 318. In this manner, the fence234 is mounted on the pivot link 246 for pivotal movement about the axisof shaft 298.

A mechanism which is best shown in Figures 3 and 7, is provided forrotating the shaft 298 about its axis relative to the pivot link 246 toeffect angular adjustment of the fence 234 relative to the table supportsurfaces 88 and 90. .ln the preferred form, this mechanism comprises aworm wheel sector 320 fixed to the shaft 298 intermediate the walls 286and 288 of the pivot link 246, and a worm pinion 322 meshing therewithand forming an integral extension of a shaft 324 journalled for rotationin a bore 325 formed through a tapered boss 326 rising from the upperface of the transverse wall 290 of pivot link 246. The shaft 324 is heldagainst :axial movement through bore 325 by a set screw 328 threadedthrough the wall of the tapered boss 326, into the bore 325, the end ofwhich engages an annular groove 330 formed around the shaft 324. A knob332 is fixed to the end of the shaft 324 opposite worm 322 to facilitaterotary manipulation of shaft 324 for effecting pivotal movement of thefence 234 relative to the pivot link 246.

Since the pivot link 246 is freely pivoted relative to the support 244about the shaft 304, the lower edge 334 of the fence 235 continuouslyrests upon the Work support surface 90of table 28 throughout the angularadjustment of fence 235. Thus, as the angular position of the fence 235relative to the pivot link 246 is shifted by rotary manipulation of theshaft 324, the pivot link 246 and the pivotraxis the fence 235 will becontinuously shifted in a pivotal manner about the axis of shaft 304which is fixed .to the support 244. The complete angular adjustment offence 235 relative to the support surface 290 can, thus, be effected bymanipulation of but a single adjusting mechanism.

To prevent movement of fence 235 after it has been adjusted in theforegoing manner, an improved locking mechanism is provided which iseffective, upon manipulation, to simultaneously fix the position offence 235 about the axis of its pivot shaft 298 and to fix the angularposition of its pivot shaft 298 about the axis of the pivot shaft 304.This mechanism is best shown in Figures 7 'and 8. A pair of lock collars338 and 340, are secured respectively to upper pivot shaft 298 and lowerpivot shaft 304 between side wall 284 and intermediate wall 288 of thepivot link 246 by pins 341 and 342. The transverse wall 290 of pivotlink 246 is formed with a 10 boss 344 extending above side walls284 and288. A- bore 346, in which a clamp stud 348 is journalled, is formedthrough this boss. The lower end of clamp stud 348 is formed with acylindrical portion 350 (Figure 8) and a threaded portion 352 uponwhich, respectively, are received a pair of opposed tapered wedges 354and 356. Wedges 354 and 356 are received between the walls 284 and 288of the pivot link 246 and are held against rotation thereby. Wedge 354bears against a shoulder 358 at the upper end of the cylindrical portion350 and the cylindrical portion 350 is freely rotatable relative theretowhile threaded portion 352 of the clamping stud 348 is threadedlyengaged with the wedge 356 so that, upon rotary manipulation of theclamping stud 348, the wedges 354 and 356 are pulled together so thattheir tapered surfaces tightly bind against the lock collars 338 and340. A lock handle 360 is fixed to the end of clamping stud 348 tofacilitate manipulation thereof. The angles of Wedges 354 and 356 arerather critical in that they should provide maximum amount of mechanicaladvantage to afford maximum locking action on the shafts 298 and 304while at the same time their angle must be large enough to eliminate anytendency toward a self locking action. I have found the optimum angle tobe in the order of 25.

Since collars 338 and 340 are fixed respectively to the upper pivotshaft 298 and to the lower pivot shaft 304, and shaft 298 is fixed tothe fence 234 and shaft 304 is fixed to the fence mount 244, rotation ofthe clamping stud 348 to draw wedges 354 and 356 into tight engagementwith the lock collars 338 and 340 not only prevents the pivotal movementof the fence 234 about the axis of its pivot shaft 298 but also preventspivotal movement of the shaft 298 and the pivot link 246 about the axisof lower pivot shaft 304. Thus, by manipulation of but a single lockingmechanism, guide fence 234 is securely fixed in its adjusted angularposition relative to the work support surfaces 88 and 90.

An improved mechanism has been provided for indicating the angularposition of the fence 234 relative to the work support surfaces 88 and90. This mechanism is of such construction that it is readily readableby an operator standing on the side of the jointer opposite that onwhich the fence is mounted and provides an accurate indication of theangular position of the fence 234 relative to the work support surfaces88 and 90 independently of any play that may exist in the mechanism foradjusting the angular position of the fence 234.

This angular fence position indicating mechanism is best shown inFigures 7 and 10. The fixed element of this indicating mechanism is aplate 362 secured as by screws 363 upon a mounting pad 364 on the top ofthe support 244 formed with an elongated slot 366 extending in thedirection of movement of the support 244 relative to the table extension238. The movable element of this mechanism is a pointer 368 mounted forlongitudinal movement through the slot 366 and bent over and formed witha point to overlap a portion of the plate 362 along a peripheral edge ofthe slot 366 as is shown in Figure 9. Suitable graduations are formed onthe plate 362 with which the end of the pointer 368 coacts to provide areadily readable indication of the angular position of the fence 234.

As is best shown in Figure 10, the pointer 368 is fixed at its lower endin a rod 370. Rod 370 is pivotally connected at one end to the rear faceof the fence 234 as by a hinge 372 and is supported adjacent its otherend by a cylindrical rod 374 extending transversely and having athrough, bore 375 intermediate its ends in which rod 370 is fixed as bybrazing. Rod 374 is supported at its ends in parallel, rectilinear guideslots 376 and 377 formed respectively in a side Wall 378 andintermediate wall 380 of the casting forming the support 244.

Referring again to Figure 10, as the angular position of fence 234 isvaried, the rod 370 is moved longitudinally relative to support 244 andwill pivot slightly about the axis of the transverse rod 374. Rod 374,being fixedto 11 rod 370 will slide along the guide slots 376 and 377 asthe rod 370 is moved. While the pointer 368 will pivot slightly aboutthe axis of rod 374 as the position of rod 370 is varied, the positionof the pointer 368 relative to the plate 362 will be constant for anygiven angular position of the fence 234 relative to the work supportsurfaces 88 and 90. The graduations formed upon the plate 362 are spacedwith this angular variation taken into account to assure accurateposition to provide an accurate indication of the angular position ofthe fence 234. Rod 370 is normally resiliently biased toward the fence234 by a conical spring 382, which at its smaller end is fixed to theend of rod 370 opposite the hinge 372 by a screw 384 and washer assemblyand which, at its larger end, abuts against the wall 262 of the castingof support 244. Spring 382 provides a counter balance effect on thefence 235 to overcome the tendency of the fence 235 to lock itself whenit is adjusted to its full 45 back position, that is tothe position inwhich face 236 forms a 45 acute angle with the top surfaces of the worksupport tables. A collar 386 is fixed to rod 370 as by a set screw 388to provide a limit for the longitudinal movement of rod 370 by abutmentwith the exterior surface of the wall 260 of the fence mount 244.

Cutter Head Guarding A novel cutter head guard arrangement has beenprovided which is of an improved construction to shield the operatorfrom the rotating cutter head 82 on both sides of the work guide 234,regardless of the transverse position to which the fence 234 isadjusted. This improved guard arrangement is best shown in Figures 2, 11and 12, wherein it is seen that the fence support 244 and the fencepivot link 246 are of such construction that they form a cutter headguard movable with the work guide fence 234 transversely of the worksupporttables 26 and 28 over the non-cutting edge of cutter head 82 sothat any portion of the cutter head 82 which is behind the fence 234 iseffectively shielded. By this improved construction, manipulation of theseveral mechanisms provides adjusting the lateral and angular positionof the fence 234 may be effected without danger of injury to theoperator from the non-cutting portions of head 82.

The portion of the cutter head 82, in front of the work guide fence 234is shielded by guard 32, which is pivotally mounted upon the rabbetingarm 34 and resiliently biased against the work guide face 236 of thefence 234 in a position over the cutter head 82. The guard 82 ispivotally supported and so formed it abuts the fence 234 just ahead ofthe cutter in all positions as shown so as to cover all portions of thecutter head 82 in front of the fence 234 regardless of the transverseadjusted position of the fence 234.

The guard 32 is mounted for pivotal movement about the axis of a shaft390 which extends through the rabbeting arm 34 and the axis of which isnormal to the plane of the work. support surface 88. The mounting ofguard 32 and of shaft 390 is shown in detail in Figure 11. As thereinshown, guard 32 is formed on its lower face with a boss 391 having abore 392 formed therein. The upper end of shaft 390 is received withinthe bore 392 by a slightly forced fit, relative movement between theguard 32 and the shaft 390 being prevented by the knurled portion 393 ofshaft 390 Within the bore 392.

The rabbeting arm 34 is formed with a hollow cylindrical portion 394depending from the lower side thereof through which the shaft 390extends, shaft 390 being rotatably received through a bore 396 in thetop wall of rabbeting arm 397. As previously indicated, the guard 32 isresiliently biased about the axis of shaft 390 into engagement with thefence 36. Mechanism forbiasing the guard 32 is provided below therabbeting arm 34 near the lower end of shaft 390, where it is easilyaccessible for adjustment of the biasing torque applied to guard 32 andwhere it does not interfere with the visibility of the front tableadjustment indicator.

This mechanism includes a generally hollow cup-shaped member 398 whichis mounted for rotation on the underside of the boss 394 around the axisof shaft 390. A torsion spring 400 is enclosed within the member 398 insurrounding relation to shaft 390, having one end fixed relative to therabbeting arm 34 and the other end fixed relative to the shaft 398 andthe member 398. Member 398 is rotatably received in an annular recess402 defined between a spring retainer washer 404 and an annular retainerring 406, both of which are secured together and to the underside of theboss 394 in coaxial alignment with the shaft 390 by screws 408. As willbecome apparent by reference to both Figures 11 and 12, member 398 isformed with an outer, generally cylindrical wall 410, and an innerconcentric wall formed by a pair of cylin' drical segments 412 and 414integrally joined at their lower ends by a radial wall 415. The shaft390 extends through the bore defined by the cylindrical segments 412 and414 while the spring 400 is received within the annual recess definedbetween the cylindrical segments 412 and 414 and the cylindrical wall410. The upper end of spring 400 is formed with a hooked portion 416,which extends through an aperture 418 formed through the washer 404, sothat, at that end, spring 400 is fixed relative to the washer 404 andthus, relative to the rabbeting arm 34. The lowest loop of spring 400 isformed with a diametrally extending portion 420 which, as is shown inFigure 12, is received in the bottom of the diametr'al slot formedbetween the cylindrical segments 412 and 414 of the member 398. In thismanner the lower end of spring 400 is fixed relative to the member 398.A diametral longitudinally extending slot 422 is formed through thelower end of the shaft 390. When the shaft 490 is in the assembledposition as shown the spring portion 420 extends through this slot 422and thus couples the shaft 390 and member 398 for concomitant rotation.A bore 423 is formed through the lower end of the shaft 390 to receive alock in the event it is found necessary to prevent unauthorized removalof the guard. In the absence of such a lock, shaft 390 may be liftedaxially sufficiently to disengage the spring portion 420 from the slot422 and thus permit rotation of the member 398 and the spring portion420 relative to the shaft 390. It is in this manner that the torqueapplied to the guard 32 and the shaft 390 by the spring 400 may bereadily adjusted. After suitable tension is created in the spring guard32 and the shaft 390 are again lowered into a position in which thespring portion 420 engages the slot 422, to thus recouple the shaft 390,member 398, and the lower portion of the spring 400 for concomitantrotation. As is best shown in Figure 12, grooves 424 are formedlongitudinally of the outside of member 398 to facilitate the manualgripping thereof for its rotation.

The invention may be embodied in other specific forms without departingfrom the spirit or essential characteristics thereof. The presentembodiment is therefore to be considered in all respects as illustrativeand not restrictive, the scope of the invention being indicated by theappended claims rather than by the foregoing description, and allchanges Which come within the meaning and range of equivalency of theclaims are therefore intended to be embraced therein.

What is claimed and desired to be secured by United States LettersPatent is:

l. The combination with a work support of an elongated work guidemovable over said work support; a work guide mount; coacting rectilinearguide elements on said support and said mount for guiding said mount fortranslatory movement relative to said support; a member mounted betweensaid mount and said support for translatory movement relative to saidsupport in the direction of movement of said mount relative to saidsupport and for translatory movement on said member; and a lock operableto simultaneously prevent such movement of said member relative to saidsupport and said mount relative to said member.

2. In combination with a machine having table structure defining anelongated work support surface and a work guide extending longitudinallythereof: a work guide support mounted on said table structure fortranslatory movement transversely of said support surface; meansmounting said work guide on said work guide support for angularadjustment relative to said support surface; releasable means forlocking said Work guide in its adjusted angular position; and means forindicating the angular position of said fence comprising a pair ofcoacting relatively movable indicator elements, one of said indicatorelements comprising a fiat scale member fixed to the top of saidsupport, and the other of said indicator elements comprising a pivotcarried by said work guide, an arm having one end pivotally connected tosaid work guide pivot and guided on said support at the other end forsliding movement beneath said scale, and a pointer overlapping a portionof said scale and fixed to said indicator arm at its other end.

3. A work guide assembly for a jointer or the like comprising a baseadapted for connection to a machine tool table and having an elongatedslot therein; a work guide support slidably mounted on said base; a workguide mounted on said support and providing a work guiding surfaceextending transversely of said guide slot; a shaft mounted at its endsin aligned journal apertures in said work guide support in verticalalignment with the longitudinal axis of said slot and having aneccentric portion extending between its journalled ends; an eye boltslidably mounted on said eccentric shaft portion with its threaded shankdepending through said slot; a nut and washer assembly threadedlysecured against axial disassembly on said eyebolt shank with the annularmargins of said washer overlapping the under portions of said basedefining said slot; and a shaft operating handle secured to said shaftand adapted to rotate said shaft in its journals and move saideccentrically supported eyebolt and nut and washer assembly betweenclamping and nonclamping engagement with said shaft and said slotthereby permitting translatory movement of said work guide in adirection normal to its length throughout a distance equal to the sumsof the length of said slot and the length of said eccentric shaftportion to eifect desired positioning of said work guide assembly withrespect to said jointer.

4. The combination defined in claim 3 wherein the work guide is mountedon said work guide support at one end thereof by a link memberjournalled at its opposite ends on said work guide and said end ofsaidsupport member and locking means in the form of a shaft journalled insaid link and a pair of opposed wedges respectively axially fixedlyjournalled and threaded on said shaft in overlapping relation to saidlink journal connections so as to selectively engage said connections isprovided for locking said work guide in selected angular relation to alongitudinal axis lying in the lower longitudinal edge of said workguide.

5. The combination defined in claim 4 together with angular adjustmentmeans for said work guide comprising a work shaft journalled in saidlink and a worm gear segment cooperating therewith and non-rotatablysecured to said work guide.

6. A lateral work guide and adjustment mechanism for a jointer having awork support table comprising a support member mounted for transversetranslatory movement over the jointer table and a single pivot linkpivoted to said support member and said lateral work guide about spacedparallel axes and a torque amplifying irreversible power transmittingmechanism operatively interposed between said lateral work guide andsaid pivot link whereby angular adjustment of said work guide can beeffected with minimum eifort.

7. The work guide and adjustment mechanism of claim 6 together with alocking mechanism comprising a pair of cooperatively coupled opposedwedges carried by said pivot link and operable to fix said lateral workguide to said support member independently of said lateral work guideadjustment mechanism whereby the secured angular position of said workguide is independent of said adjustment mechanism.

8. The work guide and adjustment mechanism of claim 6 together with alocking mechanism for said support member comprising a compound movementlocking mechanism including a first member movable relative to both saidtable and said support member through a limited path in the lateraldirection of support member movement and a second member and operatingmember therefor operable to secure said first member in its adjustedlateral position relative to both said table and to said support membersimultaneously whereby large lateral adjustment of said work guide isobtained while said operating member is maintained within the reach ofthe operator from said normal position.

9. In combination, first and second members adapted for relative pivotalmovement to preselected relatively adjusted positions, a linkinterconnecting said members and pivotable relative to each of saidmemebrs about spaced parallel pivot axes, an irreversible driveconnection and operating member therefor carried by said pivot linkoperatively interconnecting said pivot link with one of said members forcontrolling the correlative pivotal positions of said pivot link andsaid one member, and a structurally independent locking mechanismcarried by said pivot link and operable to fix the relative pivotalpositions of both of said members and said pivot link.

10. In combination, a first member, a first shaft fixed to said firstmember, a pivot link mounted upon said shaft for pivotal movementrelative to said first member, a second member and second shaft fixedthereto, means mounting said second shaft on said pivot link for pivotalmovement of said second member relative to said pivot link about an axisspaced from and parallel to the pivot axis of said pivot link relativeto said first member, a worm rotatably mounted upon said pivot link, awormwheel fixed to one of said shafts in constant meshing engagementwith said worm, and means for locking the relative positions of saidmembers comprising a first collar fixed to said first shaft, a secondcollar fixed to said second shaft in lateral alignment with said firstcollar, a third shaft rotatably mounted on said pivot link and extendingbetween said collars, and a pair of opposed wedges carried by said thirdshaft on opposite sides of the plane defined by said parallel pivot axesand so operatively connected to said third shaft that rotarymanipulation of said third shaft in one direction is effective to jamsaid wedges against said collars to prevent relative movement of saidfirst and second members and reverse rotary manipulation of said thirdshaft is effective to relieve such jamming action of said wedges.

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